Avoids irregular OnMoreData callbacks on Windows using Core Audio

content/test/webrtc_audio_device_test.h

Index: content/test/webrtc_audio_device_test.h
diff --git a/content/test/webrtc_audio_device_test.h b/content/test/webrtc_audio_device_test.h
index 64097940ccf1ba0de128625c89694488be73d23b..6bda0053456fbe40ea2d86470886e21ad9337a23 100644
--- a/content/test/webrtc_audio_device_test.h
+++ b/content/test/webrtc_audio_device_test.h
@@ -119,6 +119,7 @@ class AudioUtilInterface {
       const std::string& device_id) = 0;
   virtual media::ChannelLayout GetAudioInputHardwareChannelLayout(
       const std::string& device_id) = 0;
+  virtual int GetAudioOutputBufferSize() = 0;
 };
 
 // Implemented and defined in the cc file.
@@ -146,6 +147,7 @@ class WebRTCAudioDeviceTest : public ::testing::Test, public IPC::Listener {
   void OnGetHardwareSampleRate(int* sample_rate);
   void OnGetHardwareInputSampleRate(int* sample_rate);
   void OnGetHardwareInputChannelLayout(media::ChannelLayout* channels);
+  void OnGetHardwareBufferSize(uint32* buffer_size);
 
   // IPC::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;